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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4c4b2bbad843df5738578b36c2f175d2dc17c23161fc3d9fe04f450b4d36b0' 
  AND token = 'MrkS3cNjBAGk6414/CuVU4Y6BjKAruw06yN0R+p5P5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}