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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '171d221f33b174aa8c3fbb4c0b785b334f1a4c53ac155a85b7ad54cd3f3bedb6' 
  AND token = '/T8SvdNifGcvOwtXOtVCUU0KS71qq+opySVGSTKBSTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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