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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfa12257216a355f54277d5b4078d4b7432ba327c1d9b8f594c623743e35266' 
  AND token = '8oKMiritLPa5kqNfgTAHjQh9rg3llqfngTXFB+abE3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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