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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026f3ce0c3c3bc191676d0b81c1678a36a261fb31916d56b04c2f302e2d76109' 
  AND token = '0XVTE0GLu5ACeUD18fRYsuqSn1bGHaJSUbqCd44EhkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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