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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f4d667bf4ae71d0af46f1bb779b8915330ea54e23173e55b9f76f62c5c01f8' 
  AND token = 'KJgvSkK5248KXfzmykvLS6kNJiEJ8McvphIe6SaM8ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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