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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670ddfa188ff56e23ca81f4fb2288bdaab2aff5320b47a83bfc168e56e54a771' 
  AND token = '1R++ZrpcVk6EMaN4u6BITb7SQ+4S1ex2XN8NWtqSY0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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