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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c4e6d1e08971579042aa096a1fcd5b34bcce7f6154d54884c2b3b49123324e' 
  AND token = 'PbIiYv6YdW9otAov5zFiWjCGYQ7Bs1xHWaddONZ5uWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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