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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b79f4339eb331b024a610589a1b595704321677738ba74b38a08bc6e607916' 
  AND token = '5ds9hZmsUGIq9kzpAO6zWGEI74qwz98/xrijZh3qTqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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