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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344893a8ea004c02f0b2760a2bcb8bf10271d9c812e63d451bd2cba6eda1eb82' 
  AND token = 'iWxKfb7ZC1DopZMzP7F+En3gSip0RLyWGC3rZIZbmbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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