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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc5091f5d73a1da744a9e74427e1988ec64c013f98462c2819467b6d4e8107f7' 
  AND token = '9zNsM78Q7WTCDK3WBq7H00GmSFCOsSXVM517IBzOWjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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