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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298de0b75b74509ac1e4478510ab081bb747e7619b57168e29603fc1219c9bbf' 
  AND token = 'boOqgkH+CDT2tJXErX0cjRShnz5ThRE/Ogg+bB0JGSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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