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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf39fe965a18bc05c23f821366dbdba58dc33c258c5a2eaa092ed8468aa0a120' 
  AND token = '5jONOFEf9F6tU1yPJ+kg7cxs5wqHe0fqDs312n8le34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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