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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0ff2fa2910cdff1ac70bf652703cfb50fbd0cc473a3794e5244796b7f0188dc' 
  AND token = 'vK9JqX4V9Cd+5jZEbNlDOGdG3aHjaxrN1J7ET9zTW1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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