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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec2aa48a8d525fb407aed2474cd554571c66799904490461d073d1d905381cc9' 
  AND token = 'chGzgBIdGu3X4Xoa0sOQgW5rsBD9Dw7066h9/qCstr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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