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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b924245642cba82d2701112ca9071f627c8294690e5aeb37405e6c1d2273c14' 
  AND token = 'tk8U9oW6sZ3bJXzkcoMVq2+L034mS4HTRshQJzrPz10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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