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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d34a11a421dc6aac639fda478a1ff19369f87c99d66da51063be4abb125e44e' 
  AND token = '/biqL39fVrz8YxH0T9/Zut0+9qmC987EoatycqC5+uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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