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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a14496c56623dcee3b25d1b2634a35f5bd05dea202b8d2d3f9947bcb506094' 
  AND token = 'lYxCqbIBAVx7X7mdB9ruLOUhjb0/JEuJSceyoZu0uEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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