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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1af81056bf93645691025dacdcabd2db01d7077a576d28fa6365a83541f85db' 
  AND token = 'rOhQhvX5F3m8c5h+eG4NoOf4kkec9L3ME7At3ofiyZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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