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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31d91258f188db7028c3c3785b6b3f9683f13e427620cbc77c9620a5a407a34' 
  AND token = 'NhjtRwrtEHf+WUfdK0WR0d/7dUs9Eggo4U/PfsKPAaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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