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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4643f7ec526ff0010d986381e135ce5a9ba527522d77a530cd6cdbaeff4f6d94' 
  AND token = '2IFr+oNTmAx/iEej7tzZeI/UyBj6LBww71y8boihGfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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