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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2588700cb0c5bd9bc9040e9461be7c0e690539c8208a7176367282998d8c7c25' 
  AND token = '1Bt7486IjN6uM+gU6QU9UTt4+OmGy7YbS7NEsF04rMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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