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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f1e405981a160dc8649cf7c074a7ca43f15466ea50dd76615ce556f147853b' 
  AND token = 'Bd7eGkueSU7NMB8H6wBsKpdGU2k3vTyJ8SXd3taVemE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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