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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2abbf26d5774a16c02d81d2ac09a84a73723ada755c5f74e0036231c3dd2f2c' 
  AND token = 'm+KxEf7F/KQWGBd191cmxGNRnMsCs5mpjxsJQ7t8lH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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