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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6ea536308857f9a1eceaa0ef47f481e694db2dda98075bc1361620ec448d5a' 
  AND token = 'z/JzzWkK/FpNtOFXmMtr3zREIaemxCd4VQByAmUSf/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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