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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd09acec58fdb1717644909332282a9ee3f941d5034a09c88532ff66a329319' 
  AND token = 'B+VOzZ8G1MLbjH3KxGr6NnkUx66MkMrNOV+0pW/k+gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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