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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198e98b8397a28678a15bb94688e656f16c2e6fb0ffae86a4f6f68f41d66dd81' 
  AND token = 'lTgywgc3Jr33a0yRIm8M4ZK8h0yPiiO/sKVfNfZ70Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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