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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017755f2f5285995ccd951b61799a7564608f461d66c4f1e6ca72407540e9286' 
  AND token = 'S8nOtJT1P3THmSzNZ5dpNWIIk4ZgjOouDOp7K6O8tn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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