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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8759ff2f8964e0efcf5b50701035cf306aa5e0145691942a180be327d4fb10' 
  AND token = 'k5W4V226E+qTnR5JdkSz67tjU/7KgWt4V6A938QJ9kY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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