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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd905be3e77488d960c0b974f13ea1f6af8a4049c4a83cb606271dd0d3fbe28bd' 
  AND token = 'CV+r0Bs3K5m8TTgEqA/Bqi7q+Da4NwWU8All5n54kLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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