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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff47be7d3355100b6bdb4a567bac4d90f61e34b20fbd6dae5b2bda7b66946a55' 
  AND token = 'zqF78F1jlcfC8WE/086qkbrrBNpdq73xvdyO4+z1ThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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