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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c0a1bdca7c48276617a7d5bdcc3e2184ac39f38760d3366505e9493c0864d96' 
  AND token = 'MF4vPhETrX1h3lRaOM+YhyLQj2TI0Fh0o0lkO1ctGjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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