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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ac9fd7ad15ec679b4ad517ac03e35378b5ceb57353c97b74f2471c4655ce4c' 
  AND token = 'hB2e2HqgCkhy1bPiDWI8HKvNQ0LaEMzf0brp86jLsoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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