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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91974f2db59b07db5244bcc77ab446bd390dd325347b0355ce3027db23a55438' 
  AND token = '7ecMEx2DAA+fmYbP+7K59RV6pTnFVmCKdcOD1rfMsuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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