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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77f4a6eb5448a68f8151a3794e808ec8d2c5d4fcbfd9154ed8955f1d3d46d92d' 
  AND token = 'N2LFKdhxLezjNwbBjG5rhj02VgsXx4E6WUwl4puR4a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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