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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e64f35e762f6cc56915073a2f38c16fbde9444cc634626a644f25911cabd61' 
  AND token = 'szfo0yIkozQ8kUaLbVkMhxxYDpfbve62g/NiM3g6law=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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