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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67cd361b44eb95138b985c7db1aecdd8dfd3257b91707e1d8e15f632b2009b3' 
  AND token = 'tji3cLoykEnlIjyhIH+RTXnW68yjQtBqOVkKIpWMtP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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