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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c4cf14322b06d83b63b1f1835e6b9d5717f4a06f91697c879bc8ae4455ff9c' 
  AND token = 'A5YQrYtXVrT5Ugcbknz1xdxr1GDtB4T3e1HlfgGfnrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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