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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae9a4bf4ce72a7b5b6fc6bb2d3283d862be5bc98ec83e01daac10210e79f304' 
  AND token = 'dDcEE7GZcydC7x/A00ncUKWtTWJo2nDTDsuC6h7hp0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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