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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acba0f2c7eaf8d667cd3f97b4410ecd899d666eb11ee504efdc8707b1338e794' 
  AND token = 'D8zLnbC0koH9TkJeLo3W60GrP/BSX+mJlP4Z4I8aM7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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