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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8821141264fb7452250e14e599e6ae88a720f9448606f9b35df71d826dfa0d' 
  AND token = 'snOfQBvIOMDvAtaIKkE+Upp378FDQvbkK/rWgBNERBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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