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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98304fa2820d5555cb63f99cf1053b9f6b4d62f789429311f109fa50ff84e38e' 
  AND token = 'mT9UUmsMZ2qFA9vm9Q6sR4BPRe7tTvTJZ8clTh6VvX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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