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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '894302f274e3c5dc3ae2c6e9ea8f1a7d7d762335846d8dabc13519fe32ca3977' 
  AND token = 'MtvAi4M/AlRkfSpGolkxeRsnb+WGtHnHqzQOfShobX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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