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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939cdaab94c5e2da507a3eca9378e9be6c0165e0dbcdb16e51da54bf33652a35' 
  AND token = 'Z3EAKemSLaDsPE0IwgGi7Jg/l6wadwvoUhRextj8o94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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