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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565d9e1d088b2b4557771cc6bbeba098964a7927a14e0be4135ed0dd6009b0e0' 
  AND token = 'NTldHwPBteoJ243U64MLRKZX5dW3db5yf4gjeFzhxA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00441

JSON explain

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