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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1d539444609ec1828d989f6a4dda9becd8ee933e3478747e524dc6f7f786d0' 
  AND token = '2/m4WLpHBgjf2IXVSIcetuvbyVi8iF4OfWjzYtO7kMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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