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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae8ac66fa6535c94b96fe9dfd2ebd64901cd05b62c8e672b5ee1b2a4c9581265' 
  AND token = 'EbUvZOsVRWSqI6iTHrEd8iBKkdQgmpzT8J1lgtype1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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