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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9492c85add63fb76d906b3bf5efc78a4936291f44cb4c548980404883a56714' 
  AND token = '0uTl9wiwEF8g/FZyEE6a0qNECY3+HaTNnVf4yj9pjTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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