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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e83373dcbc528040ab2e0069cffe93f9389d912aa9e25629d1d82bde5611fb8' 
  AND token = 'oHAfu7xPVQg8QFXr1A1tkeV0PQ0hY+Vnd3yHcpNEvNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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