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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2991aeb6994bc8b90633ebf303fc29ac8f18aff8595e583cb6411135e56e968b' 
  AND token = 'XacXR5AD3QpM+RdhwcQU2AhuwT6vZC7Nlmk6mDC6q74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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