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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d10ee6da74f04fa760b383cdd41a79b7b2b0e7f6806dae178c38f7fe8ccc0a' 
  AND token = 'ToEbEK4NfV7CMkb6t58xzO6VyMP1Wdt/mMR6xi2s71o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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