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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9618c20ff42326617bab066d0b15314be0c7b36b8a37fe6f4581ad4ab396c95' 
  AND token = 'D8QXtzpoeyJ/JC4nx3F8+YBEJgaI5ChQdyBLpf3lInY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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