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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a07f7accea46d745ea544953247207376c950afe2dbb42f15ac647ae0ff14c' 
  AND token = 'p0YfUZz478TTsJ/Or2djyJwdPtgX4Ox7T0sH+PZ27g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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