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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7532e5bc53295c9eb766476445f691ae4613c391a6dffee3a986e2c7f10c080b' 
  AND token = '7EVjqfq5zgOhDwXRa5hx9BVH1rzgxPA8NzNITg70P4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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