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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ad6638e601b2c242caf5f15acb06f1f5976d889c99b599e7fe981675aaae53' 
  AND token = '+bvYEustKtpQe1Ic3Brxo9slTPJWYvYLxb92YJ0N9x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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