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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a7b90115759a1588d3b7d5c58a67dc751d5e322863828282d668b32d733341' 
  AND token = 'Sl5tYFPtlz29RLzkfoxkZiX3C0DQ63soRPH2VqfC/Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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